NCIt definition : A muscle in the posterior forearm that originates from the lateral epicondyle of the
humerus and attaches to the extensor expansion of the fifth digit; it functions to
extend the fifth digit at the metacarpophalangeal joint.;
Alternative definition : CDISC: A muscle of the forearm, in general extending from the lateral epicondyle of
the humerus to the extensor expansion of the fifth digit; primary function is to extend
the fifth digit at the metacarpophalangeal joint.;